This flu season may be particularly bad—and that flu shot you got might be of little help.

Medical experts found that Australia's flu vaccine, which has the same composition as the one used in the U.S., was only 10 percent effective in preventing the strain of the flu virus that circulated there this year, according to a perspective published in The New England Journal of Medicine this week.

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"Reports from Australia have caused mounting concern, with record-high numbers of laboratory-confirmed influenza notifications and outbreaks and higher-than-average numbers of hospitalizations and deaths," wrote the team of medical experts from U.S. National Institutes of Health's National Institute of Allergy and Infectious Diseases and the World Health Organization Collaborating Centre for Reference and Research on Influenza in Melbourne, Australia.

The team's preliminary estimates from Australia show that the season's vaccine was only 10 percent effective at preventing Influenza A (H3N2), the strain of virus that predominated Australia's flu season.

The vaccines in America could also be mismatched to the strain that circulates here this season, showing a huge flaw in strain-specific vaccinations.

"As we prepare for a potentially severe influenza season, we must consider whether our current vaccines can be improved and whether longer-term, transformative vaccine approaches are needed to minimize influenza-related morbidity and mortality," the team wrote, pushing for more research for a "universal" flu vaccine that will prevent multiples strains of virus.

Yet, this doesn't mean you should avoid getting a flu shot this year though.

"However imperfect, though, current influenza vaccines remain a valuable public health tool," the team wrote. "It is always better to get vaccinated than not to get vaccinated."

This flu season may be particularly bad—and that flu shot you got might be of little help.

Medical experts found that Australia's flu vaccine, which has the same composition as the one used in the U.S., was only 10 percent effective in preventing the strain of the flu virus that circulated there this year, according to a perspective published in this week.